form1.frm

此程序可控制文本框输入的内容,当输入为数字时为正确,否则提示出错信息.

VERSION 5.00
Begin VB.Form Form1 
   Caption         =   "Form1"
   ClientHeight    =   3090
   ClientLeft      =   60
   ClientTop       =   450
   ClientWidth     =   4680
   LinkTopic       =   "Form1"
   ScaleHeight     =   3090
   ScaleWidth      =   4680
   StartUpPosition =   3  '窗口缺省
   Begin VB.CommandButton Command2 
      Caption         =   "退出"
      Height          =   495
      Left            =   2760
      TabIndex        =   5
      Top             =   2400
      Width           =   855
   End
   Begin VB.TextBox Text2 
      Height          =   615
      Left            =   2280
      TabIndex        =   2
      Top             =   1440
      Width           =   1455
   End
   Begin VB.CommandButton Command1 
      Caption         =   "计算"
      Height          =   495
      Left            =   1080
      TabIndex        =   1
      Top             =   2400
      Width           =   855
   End
   Begin VB.TextBox Text1 
      Height          =   615
      Left            =   2280
      TabIndex        =   0
      Top             =   600
      Width           =   1455
   End
   Begin VB.Label Label2 
      AutoSize        =   -1  'True
      Caption         =   "输入a"
      BeginProperty Font 
         Name            =   "仿宋_GB2312"
         Size            =   15.75
         Charset         =   134
         Weight          =   400
         Underline       =   0   'False
         Italic          =   0   'False
         Strikethrough   =   0   'False
      EndProperty
      Height          =   315
      Left            =   1200
      TabIndex        =   4
      Top             =   720
      Width           =   825
   End
   Begin VB.Label Label1 
      AutoSize        =   -1  'True
      Caption         =   "Exp^a"
      BeginProperty Font 
         Name            =   "仿宋_GB2312"
         Size            =   15.75
         Charset         =   134
         Weight          =   400
         Underline       =   0   'False
         Italic          =   0   'False
         Strikethrough   =   0   'False
      EndProperty
      Height          =   315
      Left            =   1200
      TabIndex        =   3
      Top             =   1560
      Width           =   825
   End
End
Attribute VB_Name = "Form1"
Attribute VB_GlobalNameSpace = False
Attribute VB_Creatable = False
Attribute VB_PredeclaredId = True
Attribute VB_Exposed = False
Private Sub Command1_Click()
Dim x
 If Text1.Text = "" Then
  MsgBox "请输入系数", 48 + vbOKOnly, "提示信息"
  Text1.SetFocus
  ElseIf IsNumeric(Text1.Text) Then
   x = Val(Text1.Text)
   Text2.Text = Str(Format(Exp(x), "#.###"))
  Else
  MsgBox "输入数据错误", 48 + vbOKOnly, "提示信息"
  Text1.Text = ""
End If
End Sub

Private Sub Command2_Click()
End
End Sub